2/12/2008 @ 6:00AM

In Depth: World's Most Expensive Rental Markets

3. Moscow, Russia

$4,000 a month

Russia’s economic boom has been driven most notably by oil. Inflation helped earn Moscow the title of most expensive city in the world, according to Mercer, which based its finding on overall standard of living. Not surprisingly, housing costs are high here. Rents in the Class-A sector are up from $3,000 per month last year.